Systems Exam 6 - Seismic Monitoring

Question 1

If OBE is exceeded, whose permission is required to restart the reactor?

Answer 1

NRC

Question 2

If OBE is not exceeded…

Answer 2

Maintain Reactor at current power level, as NSSS should still be capable of operating safely.

Question 3

Seismic monitoring system activates at…

Answer 3

0.01g vertical/0.01g horizontal.

Question 4

Safe Shutdown Earthquake (SSE)

Answer 4

→0.12g horizontal, 0.08g vertical
→Design Basis Earthquake

Assured:
→RCS Pressure Boundary integrity
→shutdown and maintain safe shutdown
→no offsite exposure in excess of 10 CFR 100

Question 5

Operating Basis Earthquake (OBE)

Answer 5

→0.06g horizontal, 0.04g vertical
→reasonably expected to occur in plant life
→plant can continue to operate without undue risk to the public if NO seismic induced damage occurs and OBE exceeded light not lit
→otherwise, shutdown required and NRC permission required for a restart

Question 6

TR 13.3.31 Seismic Monitoring

Answer 6

→seismic monitoring required at all times
→must be restored within 30 days
→no subsequent actions and 3.0.3 not applicable in TRM (document in corrective action program failure to meet LCO)